I did it myself. The amp is a Alpine PDX-M12 and that cost me $500. The sub is Alpine Type R 12D4 that cost me $175. Box ran me like $30. So roughly $700.

I used the left and right underseat subwoofer wires for the signal to the amp. I used the power antenna wire for a remote turn on switch. Every thing is right in the trunk so installation was quick, easy, and painless